2 This file is part of GNUnet.
3 (C) 2001, 2002, 2003, 2004, 2005, 2006, 2008, 2009 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
21 * @file fs/fs_download.c
22 * @brief download methods
23 * @author Christian Grothoff
26 * - location URI suppport (can wait, easy)
27 * - check if blocks exist already (can wait, easy)
28 * - handle recursive downloads (need directory &
29 * fs-level download-parallelism management, can wait)
30 * - check if iblocks can be computed from existing blocks (can wait, hard)
31 * - persistence (can wait)
34 #include "gnunet_constants.h"
35 #include "gnunet_fs_service.h"
39 #define DEBUG_DOWNLOAD GNUNET_YES
42 * We're storing the IBLOCKS after the
43 * DBLOCKS on disk (so that we only have
44 * to truncate the file once we're done).
46 * Given the offset of a block (with respect
47 * to the DBLOCKS) and its depth, return the
48 * offset where we would store this block
52 * @param fsize overall file size
53 * @param off offset of the block in the file
54 * @param depth depth of the block in the tree
55 * @param treedepth maximum depth of the tree
56 * @return off for DBLOCKS (depth == treedepth),
57 * otherwise an offset past the end
58 * of the file that does not overlap
59 * with the range for any other block
62 compute_disk_offset (uint64_t fsize,
65 unsigned int treedepth)
68 uint64_t lsize; /* what is the size of all IBlocks for depth "i"? */
69 uint64_t loff; /* where do IBlocks for depth "i" start? */
70 unsigned int ioff; /* which IBlock corresponds to "off" at depth "i"? */
72 if (depth == treedepth)
74 /* first IBlocks start at the end of file, rounded up
75 to full DBLOCK_SIZE */
76 loff = ((fsize + DBLOCK_SIZE - 1) / DBLOCK_SIZE) * DBLOCK_SIZE;
77 lsize = ( (fsize + DBLOCK_SIZE-1) / DBLOCK_SIZE) * sizeof (struct ContentHashKey);
78 GNUNET_assert (0 == (off % DBLOCK_SIZE));
79 ioff = (off / DBLOCK_SIZE);
80 for (i=treedepth-1;i>depth;i--)
83 lsize = (lsize + CHK_PER_INODE - 1) / CHK_PER_INODE;
84 GNUNET_assert (lsize > 0);
85 GNUNET_assert (0 == (ioff % CHK_PER_INODE));
86 ioff /= CHK_PER_INODE;
88 return loff + ioff * sizeof (struct ContentHashKey);
93 * Given a file of the specified treedepth and a block at the given
94 * offset and depth, calculate the offset for the CHK at the given
97 * @param offset the offset of the first
98 * DBLOCK in the subtree of the
100 * @param depth the depth of the IBLOCK in the tree
101 * @param treedepth overall depth of the tree
102 * @param k which CHK in the IBLOCK are we
104 * @return offset if k=0, otherwise an appropriately
105 * larger value (i.e., if depth = treedepth-1,
106 * the returned value should be offset+DBLOCK_SIZE)
109 compute_dblock_offset (uint64_t offset,
111 unsigned int treedepth,
115 uint64_t lsize; /* what is the size of the sum of all DBlocks
116 that a CHK at depth i corresponds to? */
118 if (depth == treedepth)
121 for (i=treedepth-1;i>depth;i--)
122 lsize *= CHK_PER_INODE;
123 return offset + k * lsize;
128 * Fill in all of the generic fields for
131 * @param pi structure to fill in
132 * @param dc overall download context
135 make_download_status (struct GNUNET_FS_ProgressInfo *pi,
136 struct GNUNET_FS_DownloadContext *dc)
138 pi->value.download.dc = dc;
139 pi->value.download.cctx
141 pi->value.download.pctx
142 = (dc->parent == NULL) ? NULL : dc->parent->client_info;
143 pi->value.download.uri
145 pi->value.download.filename
147 pi->value.download.size
149 pi->value.download.duration
150 = GNUNET_TIME_absolute_get_duration (dc->start_time);
151 pi->value.download.completed
153 pi->value.download.anonymity
158 * We're ready to transmit a search request to the
159 * file-sharing service. Do it. If there is
160 * more than one request pending, try to send
161 * multiple or request another transmission.
164 * @param size number of bytes available in buf
165 * @param buf where the callee should write the message
166 * @return number of bytes written to buf
169 transmit_download_request (void *cls,
175 * Schedule the download of the specified
178 * @param dc overall download this block belongs to
179 * @param chk content-hash-key of the block
180 * @param offset offset of the block in the file
181 * (for IBlocks, the offset is the lowest
182 * offset of any DBlock in the subtree under
184 * @param depth depth of the block, 0 is the root of the tree
187 schedule_block_download (struct GNUNET_FS_DownloadContext *dc,
188 const struct ContentHashKey *chk,
192 struct DownloadRequest *sm;
196 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
197 "Scheduling download at offset %llu and depth %u for `%s'\n",
198 (unsigned long long) offset,
200 GNUNET_h2s (&chk->query));
202 off = compute_disk_offset (GNUNET_ntohll (dc->uri->data.chk.file_length),
206 if ( (dc->old_file_size > off) &&
207 (dc->handle != NULL) &&
209 GNUNET_DISK_file_seek (dc->handle,
211 GNUNET_DISK_SEEK_SET) ) )
213 // FIXME: check if block exists on disk!
214 // (read block, encode, compare with
215 // query; if matches, simply return)
217 if (depth < dc->treedepth)
219 // FIXME: try if we could
220 // reconstitute this IBLOCK
221 // from the existing blocks on disk (can wait)
222 // (read block(s), encode, compare with
223 // query; if matches, simply return)
225 sm = GNUNET_malloc (sizeof (struct DownloadRequest));
229 sm->is_pending = GNUNET_YES;
230 sm->next = dc->pending;
232 GNUNET_CONTAINER_multihashmap_put (dc->active,
235 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
237 if ( (dc->th == NULL) &&
238 (dc->client != NULL) )
239 dc->th = GNUNET_CLIENT_notify_transmit_ready (dc->client,
240 sizeof (struct SearchMessage),
241 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
243 &transmit_download_request,
250 * We've lost our connection with the FS service.
251 * Re-establish it and re-transmit all of our
254 * @param dc download context that is having trouble
257 try_reconnect (struct GNUNET_FS_DownloadContext *dc);
261 * Compute how many bytes of data should be stored in
262 * the specified node.
264 * @param fsize overall file size
265 * @param totaldepth depth of the entire tree
266 * @param offset offset of the node
267 * @param depth depth of the node
268 * @return number of bytes stored in this node
271 calculate_block_size (uint64_t fsize,
272 unsigned int totaldepth,
282 GNUNET_assert (offset < fsize);
283 if (depth == totaldepth)
286 if (offset + ret > fsize)
287 ret = (size_t) (fsize - offset);
292 for (i = totaldepth-1; i > depth; i--)
293 rsize *= CHK_PER_INODE;
294 epos = offset + rsize * CHK_PER_INODE;
295 GNUNET_assert (epos > offset);
298 /* round up when computing #CHKs in our IBlock */
299 chks = (epos - offset + rsize - 1) / rsize;
300 GNUNET_assert (chks <= CHK_PER_INODE);
301 return chks * sizeof (struct ContentHashKey);
306 * Closure for iterator processing results.
308 struct ProcessResultClosure
314 GNUNET_HashCode query;
317 * Data found in P2P network.
322 * Our download context.
324 struct GNUNET_FS_DownloadContext *dc;
327 * Number of bytes in data.
340 * Iterator over entries in the pending requests in the 'active' map for the
341 * reply that we just got.
343 * @param cls closure (our 'struct ProcessResultClosure')
344 * @param value value in the hash map (a 'struct DownloadRequest')
345 * @return GNUNET_YES (we should continue to iterate); unless serious error
348 process_result_with_request (void *cls,
349 const GNUNET_HashCode * key,
352 struct ProcessResultClosure *prc = cls;
353 struct DownloadRequest *sm = value;
354 struct GNUNET_FS_DownloadContext *dc = prc->dc;
355 struct GNUNET_CRYPTO_AesSessionKey skey;
356 struct GNUNET_CRYPTO_AesInitializationVector iv;
358 struct GNUNET_FS_ProgressInfo pi;
362 struct ContentHashKey *chk;
365 if (prc->size != calculate_block_size (GNUNET_ntohll (dc->uri->data.chk.file_length),
371 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
372 "Internal error or bogus download URI (expected %u bytes, got %u)\n",
373 calculate_block_size (GNUNET_ntohll (dc->uri->data.chk.file_length),
379 dc->emsg = GNUNET_strdup ("Internal error or bogus download URI");
381 pi.status = GNUNET_FS_STATUS_DOWNLOAD_ERROR;
382 make_download_status (&pi, dc);
383 pi.value.download.specifics.error.message = dc->emsg;
384 dc->client_info = dc->h->upcb (dc->h->upcb_cls,
386 /* abort all pending requests */
389 GNUNET_CLIENT_notify_transmit_ready_cancel (dc->th);
392 GNUNET_CLIENT_disconnect (dc->client);
396 GNUNET_assert (GNUNET_YES ==
397 GNUNET_CONTAINER_multihashmap_remove (dc->active,
400 GNUNET_CRYPTO_hash_to_aes_key (&sm->chk.key, &skey, &iv);
401 GNUNET_CRYPTO_aes_decrypt (prc->data,
407 if ( (NULL != dc->handle) &&
408 ( (sm->depth == dc->treedepth) ||
409 (0 == (dc->options & GNUNET_FS_DOWNLOAD_NO_TEMPORARIES)) ) )
411 off = compute_disk_offset (GNUNET_ntohll (dc->uri->data.chk.file_length),
417 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
418 "Saving decrypted block to disk at offset %llu\n",
419 (unsigned long long) off);
422 GNUNET_DISK_file_seek (dc->handle,
424 GNUNET_DISK_SEEK_SET) ) )
425 GNUNET_asprintf (&emsg,
426 _("Failed to seek to offset %llu in file `%s': %s\n"),
427 (unsigned long long) off,
430 else if (prc->size !=
431 GNUNET_DISK_file_write (dc->handle,
434 GNUNET_asprintf (&emsg,
435 _("Failed to write block of %u bytes at offset %llu in file `%s': %s\n"),
436 (unsigned int) prc->size,
437 (unsigned long long) off,
443 // FIXME: make persistent
446 pi.status = GNUNET_FS_STATUS_DOWNLOAD_ERROR;
447 make_download_status (&pi, dc);
448 pi.value.download.specifics.error.message = emsg;
449 dc->client_info = dc->h->upcb (dc->h->upcb_cls,
452 /* abort all pending requests */
455 GNUNET_CLIENT_notify_transmit_ready_cancel (dc->th);
458 GNUNET_CLIENT_disconnect (dc->client);
464 if (sm->depth == dc->treedepth)
467 if (sm->offset < dc->offset)
469 /* starting offset begins in the middle of pt,
470 do not count first bytes as progress */
471 GNUNET_assert (app > (dc->offset - sm->offset));
472 app -= (dc->offset - sm->offset);
474 if (sm->offset + prc->size > dc->offset + dc->length)
476 /* end of block is after relevant range,
477 do not count last bytes as progress */
478 GNUNET_assert (app > (sm->offset + prc->size) - (dc->offset + dc->length));
479 app -= (sm->offset + prc->size) - (dc->offset + dc->length);
481 dc->completed += app;
484 pi.status = GNUNET_FS_STATUS_DOWNLOAD_PROGRESS;
485 make_download_status (&pi, dc);
486 pi.value.download.specifics.progress.data = pt;
487 pi.value.download.specifics.progress.offset = sm->offset;
488 pi.value.download.specifics.progress.data_len = prc->size;
489 pi.value.download.specifics.progress.depth = sm->depth;
490 dc->client_info = dc->h->upcb (dc->h->upcb_cls,
492 GNUNET_assert (dc->completed <= dc->length);
493 if (dc->completed == dc->length)
496 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
497 "Download completed, truncating file to desired length %llu\n",
498 (unsigned long long) GNUNET_ntohll (dc->uri->data.chk.file_length));
500 /* truncate file to size (since we store IBlocks at the end) */
501 if (dc->handle != NULL)
503 GNUNET_DISK_file_close (dc->handle);
505 if (0 != truncate (dc->filename,
506 GNUNET_ntohll (dc->uri->data.chk.file_length)))
507 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
511 /* signal completion */
512 pi.status = GNUNET_FS_STATUS_DOWNLOAD_COMPLETED;
513 make_download_status (&pi, dc);
514 dc->client_info = dc->h->upcb (dc->h->upcb_cls,
516 GNUNET_assert (sm->depth == dc->treedepth);
518 // FIXME: make persistent
519 if (sm->depth == dc->treedepth)
525 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
526 "Triggering downloads of children (this block was at depth %u and offset %llu)\n",
528 (unsigned long long) sm->offset);
530 GNUNET_assert (0 == (prc->size % sizeof(struct ContentHashKey)));
531 chk = (struct ContentHashKey*) pt;
532 for (i=(prc->size / sizeof(struct ContentHashKey))-1;i>=0;i--)
534 off = compute_dblock_offset (sm->offset,
538 if ( (off + DBLOCK_SIZE >= dc->offset) &&
539 (off < dc->offset + dc->length) )
540 schedule_block_download (dc,
551 * Process a download result.
553 * @param dc our download context
554 * @param type type of the result
555 * @param data the (encrypted) response
556 * @param size size of data
559 process_result (struct GNUNET_FS_DownloadContext *dc,
564 struct ProcessResultClosure prc;
570 GNUNET_CRYPTO_hash (data, size, &prc.query);
572 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
573 "Received result for query `%s' from `%s'-service\n",
574 GNUNET_h2s (&prc.query),
577 GNUNET_CONTAINER_multihashmap_get_multiple (dc->active,
579 &process_result_with_request,
585 * Type of a function to call when we receive a message
589 * @param msg message received, NULL on timeout or fatal error
592 receive_results (void *cls,
593 const struct GNUNET_MessageHeader * msg)
595 struct GNUNET_FS_DownloadContext *dc = cls;
596 const struct PutMessage *cm;
599 if ( (NULL == msg) ||
600 (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_FS_PUT) ||
601 (sizeof (struct PutMessage) > ntohs(msg->size)) )
603 GNUNET_break (msg == NULL);
607 msize = ntohs(msg->size);
608 cm = (const struct PutMessage*) msg;
612 msize - sizeof (struct PutMessage));
613 if (dc->client == NULL)
614 return; /* fatal error */
615 /* continue receiving */
616 GNUNET_CLIENT_receive (dc->client,
619 GNUNET_TIME_UNIT_FOREVER_REL);
625 * We're ready to transmit a search request to the
626 * file-sharing service. Do it. If there is
627 * more than one request pending, try to send
628 * multiple or request another transmission.
631 * @param size number of bytes available in buf
632 * @param buf where the callee should write the message
633 * @return number of bytes written to buf
636 transmit_download_request (void *cls,
640 struct GNUNET_FS_DownloadContext *dc = cls;
642 struct SearchMessage *sm;
650 GNUNET_assert (size >= sizeof (struct SearchMessage));
653 while ( (dc->pending != NULL) &&
654 (size > msize + sizeof (struct SearchMessage)) )
657 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
658 "Transmitting download request for `%s' to `%s'-service\n",
659 GNUNET_h2s (&dc->pending->chk.query),
662 memset (sm, 0, sizeof (struct SearchMessage));
663 sm->header.size = htons (sizeof (struct SearchMessage));
664 sm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_START_SEARCH);
665 if (dc->pending->depth == dc->treedepth)
666 sm->type = htonl (GNUNET_DATASTORE_BLOCKTYPE_DBLOCK);
668 sm->type = htonl (GNUNET_DATASTORE_BLOCKTYPE_IBLOCK);
669 sm->anonymity_level = htonl (dc->anonymity);
670 sm->target = dc->target.hashPubKey;
671 sm->query = dc->pending->chk.query;
672 dc->pending->is_pending = GNUNET_NO;
673 dc->pending = dc->pending->next;
674 msize += sizeof (struct SearchMessage);
677 if (dc->pending != NULL)
678 dc->th = GNUNET_CLIENT_notify_transmit_ready (dc->client,
679 sizeof (struct SearchMessage),
680 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
682 &transmit_download_request,
689 * Reconnect to the FS service and transmit our queries NOW.
691 * @param cls our download context
695 do_reconnect (void *cls,
696 const struct GNUNET_SCHEDULER_TaskContext *tc)
698 struct GNUNET_FS_DownloadContext *dc = cls;
699 struct GNUNET_CLIENT_Connection *client;
701 dc->task = GNUNET_SCHEDULER_NO_TASK;
702 client = GNUNET_CLIENT_connect (dc->h->sched,
707 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
708 "Connecting to `%s'-service failed, will try again.\n",
714 dc->th = GNUNET_CLIENT_notify_transmit_ready (client,
715 sizeof (struct SearchMessage),
716 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
718 &transmit_download_request,
720 GNUNET_CLIENT_receive (client,
723 GNUNET_TIME_UNIT_FOREVER_REL);
728 * Add entries that are not yet pending back to the pending list.
730 * @param cls our download context
732 * @param entry entry of type "struct DownloadRequest"
736 retry_entry (void *cls,
737 const GNUNET_HashCode *key,
740 struct GNUNET_FS_DownloadContext *dc = cls;
741 struct DownloadRequest *dr = entry;
743 if (! dr->is_pending)
745 dr->next = dc->pending;
746 dr->is_pending = GNUNET_YES;
754 * We've lost our connection with the FS service.
755 * Re-establish it and re-transmit all of our
758 * @param dc download context that is having trouble
761 try_reconnect (struct GNUNET_FS_DownloadContext *dc)
764 if (NULL != dc->client)
768 GNUNET_CLIENT_notify_transmit_ready_cancel (dc->th);
771 GNUNET_CONTAINER_multihashmap_iterate (dc->active,
774 GNUNET_CLIENT_disconnect (dc->client);
778 = GNUNET_SCHEDULER_add_delayed (dc->h->sched,
779 GNUNET_TIME_UNIT_SECONDS,
786 * Download parts of a file. Note that this will store
787 * the blocks at the respective offset in the given file. Also, the
788 * download is still using the blocking of the underlying FS
789 * encoding. As a result, the download may *write* outside of the
790 * given boundaries (if offset and length do not match the 32k FS
791 * block boundaries). <p>
793 * This function should be used to focus a download towards a
794 * particular portion of the file (optimization), not to strictly
795 * limit the download to exactly those bytes.
797 * @param h handle to the file sharing subsystem
798 * @param uri the URI of the file (determines what to download); CHK or LOC URI
799 * @param meta known metadata for the file (can be NULL)
800 * @param filename where to store the file, maybe NULL (then no file is
801 * created on disk and data must be grabbed from the callbacks)
802 * @param offset at what offset should we start the download (typically 0)
803 * @param length how many bytes should be downloaded starting at offset
804 * @param anonymity anonymity level to use for the download
805 * @param options various options
806 * @param cctx initial value for the client context for this download
807 * @param parent parent download to associate this download with (use NULL
808 * for top-level downloads; useful for manually-triggered recursive downloads)
809 * @return context that can be used to control this download
811 struct GNUNET_FS_DownloadContext *
812 GNUNET_FS_download_start (struct GNUNET_FS_Handle *h,
813 const struct GNUNET_FS_Uri *uri,
814 const struct GNUNET_CONTAINER_MetaData *meta,
815 const char *filename,
819 enum GNUNET_FS_DownloadOptions options,
821 struct GNUNET_FS_DownloadContext *parent)
823 struct GNUNET_FS_ProgressInfo pi;
824 struct GNUNET_FS_DownloadContext *dc;
825 struct GNUNET_CLIENT_Connection *client;
827 GNUNET_assert (GNUNET_FS_uri_test_chk (uri));
828 if ( (offset + length < offset) ||
829 (offset + length > uri->data.chk.file_length) )
834 client = GNUNET_CLIENT_connect (h->sched,
839 // FIXME: add support for "loc" URIs!
841 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
842 "Starting download `%s' of %llu bytes\n",
844 (unsigned long long) length);
846 dc = GNUNET_malloc (sizeof(struct GNUNET_FS_DownloadContext));
850 dc->uri = GNUNET_FS_uri_dup (uri);
851 dc->meta = GNUNET_CONTAINER_meta_data_duplicate (meta);
852 dc->client_info = cctx;
853 if (NULL != filename)
855 dc->filename = GNUNET_strdup (filename);
856 if (GNUNET_YES == GNUNET_DISK_file_test (filename))
857 GNUNET_DISK_file_size (filename,
860 dc->handle = GNUNET_DISK_file_open (filename,
861 GNUNET_DISK_OPEN_READWRITE |
862 GNUNET_DISK_OPEN_CREATE,
863 GNUNET_DISK_PERM_USER_READ |
864 GNUNET_DISK_PERM_USER_WRITE |
865 GNUNET_DISK_PERM_GROUP_READ |
866 GNUNET_DISK_PERM_OTHER_READ);
867 if (dc->handle == NULL)
869 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
870 _("Download failed: could not open file `%s': %s\n"),
873 GNUNET_CONTAINER_meta_data_destroy (dc->meta);
874 GNUNET_FS_uri_destroy (dc->uri);
875 GNUNET_free (dc->filename);
876 GNUNET_CLIENT_disconnect (dc->client);
881 // FIXME: set "dc->target" for LOC uris!
884 dc->anonymity = anonymity;
885 dc->options = options;
886 dc->active = GNUNET_CONTAINER_multihashmap_create (2 * (length / DBLOCK_SIZE));
887 dc->treedepth = GNUNET_FS_compute_depth (GNUNET_ntohll(dc->uri->data.chk.file_length));
889 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
890 "Download tree has depth %u\n",
893 // FIXME: make persistent
894 schedule_block_download (dc,
895 &dc->uri->data.chk.chk,
897 1 /* 0 == CHK, 1 == top */);
898 GNUNET_CLIENT_receive (client,
901 GNUNET_TIME_UNIT_FOREVER_REL);
902 pi.status = GNUNET_FS_STATUS_DOWNLOAD_START;
903 make_download_status (&pi, dc);
904 pi.value.download.specifics.start.meta = meta;
905 dc->client_info = dc->h->upcb (dc->h->upcb_cls,
913 * Free entries in the map.
915 * @param cls unused (NULL)
917 * @param entry entry of type "struct DownloadRequest" which is freed
921 free_entry (void *cls,
922 const GNUNET_HashCode *key,
931 * Stop a download (aborts if download is incomplete).
933 * @param dc handle for the download
934 * @param do_delete delete files of incomplete downloads
937 GNUNET_FS_download_stop (struct GNUNET_FS_DownloadContext *dc,
940 struct GNUNET_FS_ProgressInfo pi;
942 // FIXME: make unpersistent
943 pi.status = GNUNET_FS_STATUS_DOWNLOAD_STOPPED;
944 make_download_status (&pi, dc);
945 dc->client_info = dc->h->upcb (dc->h->upcb_cls,
948 if (GNUNET_SCHEDULER_NO_TASK != dc->task)
949 GNUNET_SCHEDULER_cancel (dc->h->sched,
953 GNUNET_CLIENT_notify_transmit_ready_cancel (dc->th);
956 if (NULL != dc->client)
957 GNUNET_CLIENT_disconnect (dc->client);
958 GNUNET_CONTAINER_multihashmap_iterate (dc->active,
961 GNUNET_CONTAINER_multihashmap_destroy (dc->active);
962 if (dc->filename != NULL)
964 if (NULL != dc->handle)
965 GNUNET_DISK_file_close (dc->handle);
966 if ( (dc->completed != dc->length) &&
967 (GNUNET_YES == do_delete) )
969 if (0 != UNLINK (dc->filename))
970 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
974 GNUNET_free (dc->filename);
976 GNUNET_CONTAINER_meta_data_destroy (dc->meta);
977 GNUNET_FS_uri_destroy (dc->uri);
981 /* end of fs_download.c */